Improvement in tan-bark leaches



' leeches for extracting the tannin Iproperties from S, S1, S, and S3, and the opposite ends supported on lllnlll :ienne prima amm,

LEWIS o. ENGLAND, or PHILADELPHIA, PENNSYLVANIA. i i

Letters Patent No. 96,212, dated October'l, 1869.

IMPROVEMENT IN TAN-BARK LEACHES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

'Be it known that I, LEWIS C. ENGLAND, of the cityv and county of Philadelphia, and Statie of Pennsylvania, have invented a new and useful Improvement in Tan-Bark L eaches; and I do herebydeclare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention consists in constructing the circular ends of the upright tube through from the adjacent vat, and t into the bore of the tubes C and C', so as to allow a free communication with them. v

Passing around the outside of the lsection near the top, and connected with the rats A andvA, is a tube, B, the connection with it and the vat 'Az being throu rh the upright tubes S, and the commu-l nication with the vat A is made by means of the short pipes D.

The leach-vats are heated by means of steam passed through the coil or strands of pipes E, and the water introduced into each vat through the tube lor hollow logL and the discharge-pipes J, J, J2, and J, the communication between these pipes and the tube L being openedand closed by means of a tapering plug, G, inserted through an opening made in the top side of the tube L, this opening being closed by means of the plug H. When it is desired to remove the plug G, a hook is inserted through the opening in the tube L, and caught into a rod, secured across the centre of it,l as shown in fig. 3.

The operation is as follows:

The openings in the pipes l), being closed by meansi of the plugs P, and those in the upright tubes S, byA the plugs l, and the tubes G and C placed inposition in the vats A2 and A3, water .is then conveyed into each-of the vats, partially filling them. A suiicent quantity 'of ground bark is then placed in the vat A, and more water introduced into this vat, until it 'is entirely full.

It is then allowed to stand the proper length of time, when the sanne quantity'of groundbark is i-ntroduced in the vat' Al. rlhe plugs l?1 are then withdrawn, and the tubes G placed over'the ends of the tubes S, and the plugs `then inserted in the ends of the tubes S. The liquor which has passed down through the bark in the vat Awll be collected evenly in the bottom of it, and will pass through the perforations in the tubes T, and 'up the side tubes VS, and through the perforations in the tube C, and will be distributed evenly and .thoroughly over the surface of the vat A1.

l`hevat-A1 is then supplied with more water, sufficient to fill the vats A and A1. Fresh ground bark is then introduced into the vat A. The l'plugs Pl are now withdrawn from the'tubes S1, and inserted in the tubes S2, and the tubes C placed over the ends of the tubes S1. The water from the vat A1 will now ow into the vat A2, through the perforated tubes T2 and O', the water following from vat A,iuto which suii'icient water is introduced `to illl the three vats.

A sufficient quantity of fresh-ground bark is then introduced into vat A, and the plugs P1 removed from s, which pass bark, under downward hydraulic pressure, so that the liquor is collected evenly at the bottom of the leaches, by means of perforated tubes placed therein, and is conveyed upward, face of each succeeding leach-vat through perforated tubes, placed across and nea-r the top, thus allowing it to thoroughly commingle and pass through the bark, in every portion of each vat; consequently, l am enabled to extract the tannin from every particle of bark. Heretofore, in the ordinary press-leach, where one tube, placed in the centre of the leaches, has been em# ployed to convey the liquor from one vat to anpther, caused the liquor to pass in a current through the whole section of leaches, without being distributed evenly over and through the bark.A

Figure 1 is a plan view of my improvement in tanbark leaches, with the false'bottom removed from one of the leaches.

Figure 2 is a sectional view of same on the line afb. Figure Sis a sectional view of a portion of the top ube'.

To enable those skilled in the art to make and use my invention, I willv now proceed to describe its construction and operatiom The leach-vets A, A1, A2, and A, are of ordinary construction, and made perfectly water-tight.

In the bottom, and running transversely across each vat, is a series of tubes, T, Tl, T2, and T3, through the opposite sides of which is formed a series of perforations.

AOne end of each of the said tubes is made open, and the opposite ends connected to upright pipes S,'Sl, S2, and S, secured to the inner side of the leach-vets.

The upper ends of these tubes pass through and enter near the top of the adjacent leach-vat, and 'are made circular in form, where they pass through the side of the vat, andprovided with adjustable plugs P and P3. l

The. tubes C and O', which are placed across and near 'the top of each vat, are each perforated through' opposite sides, and have one end closed, and supported by means of a notch cut onvthe' outside of the tubes` of leaches A; through the 'hollow log or tube L and discharge--` pipe J. Tbe liquor in the vat A, or last filled vat, is now as strong as' it would be in a section of four caches.

The liquor is now drawn from the bottom of the vat A3, in quantity equal to the amount that-one leach would contain. The plugs P1 are then placed in the upper ends ot' pipes Si, and the water or weak liquor iuvat A pumped into the vat Ail. The vats A1, A2, and A3 are now all full again. The vat A, being cut oi from the rest of the sections by means of the plugs l, inserted in the tubes S, allows the spent which ti'esh bark is placed, and the plugsP withdrawn from the pipes D, and perforated tubes placed over the ends ot' these pipes, through which the liquor from vat A3, flowing around and through the tube B, passes, water is now added to vat A, and the operation repeated. In practice, from four to ten leach-vate are used in a section.'

When it is desired to make the liquor as' strong as it'can be made from tine-ground bark, (Without evaporating,) a larger numberot vats are used.

Having thus described my invention, its construetion and operation,

What I claim, and desire to secure by Letters Pat.- eut ofthe United States, is-

l. lhe lower perforated tubes T, T1, &c., and upper perforated tubes C and C',arranged.andnvoperating as herein' speciied. i

2. The arrangement of theoutside tube B, upright or side tubes S, S1, Ste., connecting-pipes D, and plugs P and P1, as and for the purpose specified.

3. The arrangement ofthe steam-pipe E, placed in the bottom of the vats, and on top ot' the perforated tubes T, T1, Ste., as and for the purpose speoied.

In testimony whereo'I have hereunto signed my name, in the presence of two subscribing witnesses.

LEWIS C. ENGLAND.

Witnesses:

lsAAo R. OAKFORD, Gmo. E. NICHOLS. 

